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Derivative Instruments (Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments $ 0 $ (127) $ (2,440)
Others [Member]      
Derivative [Line Items]      
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments 0 (127) (244)
General and Administrative Expense [Member] | Total Equity Return Swap [Member]      
Derivative [Line Items]      
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments 0 0 (1,743)
Loss excluded from Adjusted EBITDA     1,252
Net Interest Expense [Member] | Total Equity Return Swap [Member]      
Derivative [Line Items]      
Derivative Not Designated as Hedging Instruments, (Loss) Gain Recognized in Income on Derivative instruments $ 0 $ 0 $ (453)